Flying cutter



4Maly 22, 1934, F. c, BIGGERT, JR., ET AL 1,959,852

FLYING CUTTER Filed Oct. 25, 1929 5 Sheets-Sheet l VVITNESSES May 22,1934, F..c. B1GGERT, JR., Er AL 1,959,852

FLYING CUTTER Filed OCT.. 25. 1929 3 Sheets-Sheet 2 May 22, 1934. F.BIGGERT, JR., ET Al. 1,959,852

VFLYING CUTTER Filed OCT.. 25, 1929 3 Sheets-Sheet 3 Jag. 6

/38 /Jaa INVENTOR y. @@Qmmaw Patented May 22, 1934 FLYING' CUTTERFlorence C. Biggert, Jr., Crafton, and John A. Smitmans, Pittsburgh,Pa., assignors to United Engineering & Foundry Company,

Pittsburgh,

Pa., a corporation of Pennsylvania Application October 25, 1929, SerialNo. 402,382

25 Claims.

Our invention pertains to ying cutters for severing moving material,such, for instance, as metal strip or the like coming from Va rollingmill.

Where, as has heretofore been proposed, the

material is cut by means of a blade disposed transversely to thematerial and rotated at a peripheral speed substantially the same as thelinear speed of the material, the lengths into which the material is cutare necessarily multiples 0 or the periphery of the circle described bythe blade, which imports a limitation on the closeness of themeasurements to which the material can be cut. It is an object of ourinvention to obviate such limitation, and to provide a ying cuttercapable of cutting the material into any desired lengths, and ofoperating on such material, during its movement, at any desired point. Afurther object of our invention is to provide a flying cutter, of thecharacter in which the blade is put into effective operation whenever acut is desired to be made, which is exceptionally adapted for operatingon material moving at very high speeds, such as those encountered instrip rolling mills. And other objects will appear from the followingspecification and claims.

As an example of an embodiment of our invention, a iiying cutterconstructed in accordance therewith is describedv in the followingspecification and shown in the accompanying drawings, in which:

Fig. 1 is an end view of the cutter as seen in the direction of movementof the material, in this instance strip issuing from a rolling mill;

Fig. 2 is a side elevation of the same, the cutting blade being shown inthe stationary posi,l

tion it occupies when not in operation;

Fig. 3 is a diagrammatic side view, showing the "blade, in full lines,in its cutting position, the stationary position of the'fblade beingshown in 40 dotted lines;

Fig. 4 is a similar view showing the blade ata position such as itassumes when about to reverse its direction of movement to returntowards its normal stationary position;

Fig. 5 is'a similar view showing the blade during its return movement,when it is approaching its normal stationary position; and

Fig. 6 is a schematic wiring diagram showing one electrical system whichmay be employed for controlling the operation. of a blade-actuatingelectric motor for obtaining the desired move- Yment of the blade, thecircuit, and the control apparatus therein, being shown 1n its normaldeenergized condition.

Referring now-to the drawings, the particular form of dying cutterselected for illustration and shown therein is intended for cuttingstrip as it issues from a rolling mill, and comprises an anvil roll 10rotatably mounted in bearings carried by a stand 11 and driven, throughsuitable reduction 60 gearing 12, at a peripheral speed which issubstantially the same as the linear speed of the strip, by means of anelectric motor 13, hereinafter referred to as the anvil motor. It willbe appreciated that the linear speed of the strip, generally referred toas the mill speed, will vary with. different jobs. Accordingly, means ofa well known character are provided for running the anvil motor 13 atvarying speeds, to'accord with the mill speed which may obtain at thatparticular time.

For cutting the strip when desired a blade 14 is provided, adapted towork against the anvil roll 10 and make cutting engagement with thestrip as the latter passes above such anvil roll. The blade is mountedin a blade holder 15 which is secured to a shaft 16 rotatably mounted inbearings carried by the stand 11. The shaft 16 is adapted to be rotatedin a clockwise direction, as seen in the side views (it being understoodthat 30 the strip enters the device from the right), by an electricmotor 17, hereinafter referred to as the blade motor. The blade is 'thusrotated, from the stationary position shown in Fig. 2, through more thana complete revolution, during which movement it makes the cut, and isthen caused to rotate in a reverse direction until it regains itsoriginal stationary position.

To determine the normal stationary position of the blade, the followingmeans are employed in the particular device shown: The base of the bladeholder l5, or other suitable member on the shaft 16, is formed toproduce a snail cam 18, at the ends of which is a shoulder 19. Thisshoulder is adapted to engage, in a counter-clockwise direction, theendl of a dog 20 which is pivoted to a lever 21 and is provided with atail-piece 22 adapted to engage the inner surface of' a collar 23 whichis xedly mounted on the stand 11, concentric with the blade holder shaft16. The lever 21 is provided with a manually operable latch 24 adaptedto engage in one or another of a series 1 of teeth 25 formed on theouter periphery of the collar 23, so that the position of the lever, andconsequently of the dog 20 pivoted thereto, may 105 be adjusted asdesired. It will be noted that the dog 2 0 supports the blade holder 15in the desired stationary position, such as that shown in Fig. 2,permitting the free passage of the strip between it and the anvil roll,but that the blade holder 1 10 nevertheless can rotate in a clockwisedirection, the dog 20 then riding up the snail cam 18 and snapping overthe end of the latter when a rotation has been completed.

@3A limit switch 26, which may be of the well known drum type, isconnected to rotate with the blade holder shaft 16, and effects thestarting and certain of the other manipulations of the blade motor 17.When the strip is to be cut, an electrical contact is made, eithermanually, or automatically, to cause current to be supplied to the blademotor to cause the latter to rotate in a forward direction. The blademotor, and the-resistances etc. in its circuits, is so constituted thatby the time the blade has rotated from its stationary position, shown inFig. 2, to its cutting position shown in Fig. 3 it will have beenaccelerated to just that extent that the peripheral speed of its edgewill be substantially the same as the linear` speed of the material.That this condition may continue to obtain, in spite of the fact thatthe mill speed may vary, we provide control means between the anvilmotor 13 and the blade motor 17 so that the speed of the blade motor, atleast during the forward accelerating portion of its cycle of operation,will be dependent uponthe speed of the anvil motor andvconsequently uponthe mill speed.

It will be observed that the peripheral speed to which the blade 14 isaccelerated will be dependent upon the length of the circular `paththrough which it moves to reach the cutting position; so that theperipheral speed of the blade, at the cutting instant, can be controlledby modifying the original stationary position of the blade. This can beeffected by shifting the dog 20, through an adjustment of the lever 21.

Substantially when the cut occurs, the limit switch 26 operates to break'the circuit supplying current to the blade motor 17, and, slightlylater, operates to establish a circuit supplying current to such motorin a reverse direction. However, owing to the momentum of the blade andblade-holder, the motor armature, etc., these parts continue to rotatein a clockwise direction, against the braking effect of the reversedmotor current, until they are brought to rest in some such location asis indicated by the position of the blade holder shown in Fig. 4. Whenthe blade motor and blade holder thus come to rest, resistance isintroduced into the reversed motor circuit, to prevent too much speed inthe return movement of the blade holder, and the parts rotate in acounter-clockwiseI direction until some such position of the blade 14 isreached as is indicated in Fig. 5, whereupon the motor circuit isbroken. Thereafter, by reason of the weight of the bladeholder 15 andassociated members, the parts settle in a` counter-clockwise directionuntil the shoulder 19 again rests on the'dog 20. The parts are 'then inposition for another cut.

In orderfto indicate adjustments which may be desirable in operation,such as an adjustment of the position of the dog 20, we provide means bywhich the peripheral speed of the blade, at

4the cutting instant, may be read. If such peripheral speed does notaccord with the mill speed, the dog 20, for instance, may be adjusted tocure the defect. One'such means conveniently consists of a fly wheel 27,having a driving connection with the blade holder shaft 16 so as torotate with the latter, such fly wheel having a ratchetconnection withits shaft, so as to be driven in one direction only. Thus the fly Wheel27 will be accelerated up to the highest speed of rotation with themotor.

the blade holder (which is reached at substantially the cuttinginstant), and will thereafter rotate at substantially such speed for ashort time, suiiicient to enable a reading to be taken, of its ownmomentum. The fly wheel 27 may take the form of a gear with which meshesa pinion 28 on the shaft of a magneto 29 furnished with an indicator 30.From this indicator the peripheral speed of the blade, at the cuttinginstant, can be read and any desirable adjustments accordingly made.

In Fig. 6 of the'drawings we have illustrated one form of system capableof controlling the operation of the blade motor in the manner abovereferred to. In this system the armature 101 of the motor` is connected,in series relation with its series field winding 102 and a plurality ofresistor sections 103, 104 and 105, across lines 106 and 107 which arein turn connected to a source of current supply 111. In parallelrelation with'this circuit is another circuit including a shunt fieldwinding 112 for the motor;

For establishing the circuit of the armature 101, and controlling thedirection of flow of cur-rent therethrough so that the motor may beactuated in either direction, a pair of .forward switches 113 and 115,and a pair of reverse switches 114' and 116 are provided. To provideautomatically for controlling the operation of these and other switchesin the system, a drum limit switch 26 is employed, and, as referred tohereinbefore, is operably coupled for Such limit switch comprises a pairof continuous supply bands 118 and 119 and three shorter. bands 121, 122and 123, of which the bands 118 and 121 are connected together, as alsoare the bands 119, 122 and 123. A line of brushes 11841, 119a., 121a,12211, and 123a are adaptedl to make contact with the correspondinglynumbered bands, the relative positions of the bands and brushes, in thenormal deenergized condition Aof the system, being indicated by the linea in the diagram, in which the bands are shown in development.

A push button 124, normally occupying the upper position shown in thediagram, is shown as the means for starting the operation of the system.The contact 124a of this button, when depressed, establishes a circuitextending from line 106 through the actuating coil 1250. of a lowvoltage relay 125 to line 107. The low voltage relay has a holdingcontact 12517, adapted to establish a holding circuit through thecoil-12511. after the relay has once been actuated.

a contact 125e, adapted to establish connection between the line 106 andsupply band 118, through the brush 118a, when the relay is actuated, anda back contact 125d adapted to establish connection between the line 106and the supply band 119, through the brush 119a, when the relay isreleased. Thus when the low voltage relay 125 is actuated, upon the pushbutton 124 being depressed, the brush 118m and supply band 118 areconnected to the line 106, the brush 119a and supply band 119 aredisconnected from the line 106, and a holding circuit is establisliedwhich maintains the relay closed vin spite of the subsequent release ofthe push button. y

Upon the Vpush button 124 being released after actuation, its contact124a throws into operation a forward relay 128 which establishes aholding circuit for itself and also throws into operation the forwardswitches 113 and 115 .to cause the blade motor to rotate in the forwarddirection.

The circuit for originally operating the forward relay 128 is from thebrush 118m through the raised push-button contact 124a, forward relayactuating coil 1280, and back contact 114e (to be hereinaftery referredto) to the line 107. The holding circuit is from the line 106 through aholding contact 12817 of the forward relay, the v actuating coilv ofsuch relay and the back consupply band 118 through the band 121, brush.

tactil/le to the line 107. The circuit for actuatingthe forward switches113 and 115 is from the v101 will be established, and will be maintainedce c,

until broken at a later period as hereinafter explained. The inotor 101rotates the blade-holder towards cutting position, and accelerates suchblade holder so that the blade reaches face speed with the strip by t. etime the cutting position is reached.

To provide Yfor variation of the speed of the blade motor in accordancewith'variations of the mill speed, so that the acceleration ofthe bladeup to face speed with the strip may be maintained in spiteof suchchanges in the mill speed,

we provide means, cent-rolled by the speed of the strip, for cutting inor out sections of a resistance connected in series with thek motor. Tothis end, two (though more may be employed if it be desired that thecontrol be more delicate) speed controlled switches 129 and 131, areconnected, in parallel relation, between the brush 118e and the line107. These switches have in their circuits the actuating coils 132a and133:1 of switches 132 and 133, adapted, when closed,- to establishshunt/,circuits around the resistor `section 103 and the resistorsections 103 and 104, respectively, these resistor sections beingconnected in series with the motor. The'switches .129 and 131 may begovernor controlled, as indicated, or may be controlled by currentconditions existing in other elec.iical circuits employed in the use ofthe mitten-as, for instance, in the eld circuit of the anvil motor 13.They are responsive to the mill speed, and each to a different degreethereof. Suppose, for example, the mill speed is relatively low, thenswitches 129 and 131 will remain open, leaving the resistor sections103 and 104 eiective. When the mill speed is increased somewhat, theswitch 129 will close, shunting the resistor section V103 andconsequently speeding up the motor 101. When the mill speed is increasedfurther, the switch 131 will close, shuntingv the resistor sections 103and 104- and further increasing the speed of the motor 101.

By the time the blade has reached the cutting po ion, the limit switchwill have moved, in the direction of the arrow shown at the top thereofin 6, to such aposition that the line of contact of the bands with thebrushes will be at b.

When this position is reached, the end oi the band "1 passes frombeneath the brush 121a,

.L thereby breaking the holding circuits of the forl ward'switches 113and 115, allowing these to open,

.. land also breaking the holding circuit of thelow "voltage relay 25,rallowing its Acontact 125e to open, and its back contact 125d to close.

.I `After the forward switches .113 andl 115 have thusv been opened,andthe motor rcircuit thereby.

broken, the vmotor and blade-holdercontinue to rotate, of theirmomentum, until they and the limit switch have slightly passed theiroriginal position and have reached a position, in the second rotation,where the relation of the bands to the brushes is as indicated by thebroken line c. At this point, the band 123 comes into contact with itsbrush 123a, between which latter andthe line 107 the actuating coils114a and 116a of the reverse switches 114 and 116 are connected. Thus acircuit is established from line 106 through the back Contact 125ml (nowclosed) of the low voltage relay, brush 119:1, supply band 119, band123, brush 123a and actuating coils 114a and 116a, to line 107. Therebythe reverse switches 114 and 116 are closed and current is applied tothe motor in a reversed direction. So that a full plugging current maybe applied to the motor at this time, a shunt circuit is provided aroundthe whole resistor comprised by the sections 103, e

104 and 105, vsuch shunt circuit having therein a normally open switch135. The actuating coil 13'5a of such switch is connected, through acontact 126D of anotherswitch 126, to be hereinafter referred to,between the brush 119er andthe line 107; so that when the back contact125d of the low voltage relay is closed and the contact 1266 is closed(as the latter is at this period in the cycle), the actuating coil 135awill be energzed and the shunt circuit established around the resistorsections 103, 104 and 105. A powerful plugging current is thus appliedto the motor, having the eiect of braking the rotating parts and finallybringing them to rest at a position of the blade holder which may be asshown in Fig. 4, the relative positions of tliebanols and brushes of thelimit switch being then as indicated by the broken line d in Fig. 6.

After the motor has come to rest the reversed current starts itbackward, to return the blade to its starting position, the drum switchthen rotating in the direction indcated by the arrow at the bottom orthe limit switch (Fig. 6). That the motor may not operate too rapidly instarting this reverse movement, the resistor sections 103, 104 and 105are cut in again substantially at the instant of physical reversal, anda shunt circuit, including a suitable resistor 137, is establishedacross the motor armature. These results are effected by a switch 126having an actuating coil 126e and a holding coil 126C. The actuatingcoil l26a is in circuit relation with the contact 125e of the lowvoltage relay, and thus is energized, to raise the switch, when suchrelay is first operated. The holding coil 126e, with asuitableresistance 134, is connected in shunt with the motor armature.Thus after the actuating coil 126a`has been deenergized, due to theopening of the low voltage relay at the time the cut is made, theholding coil 126e remains still energized by the counter-electromotiveforce of the armature, so that the switch 126 continues to be held inits raised position, with its contact 126b closed and its back contact1261i open. At about the point of physical reversal of the motor,however, the lcounter-elect.rornotive force of the armature havingdropped, the holding coil 126e loses suflicient strength to sustain theswitch 126, which thereupon drops, opening its Contact 12622 and closingits back Contact 126:1. Opening the contact 126?) breaks the circuit inwhich is the actuating coil 135a of the switch 135; so that the switch135 opens, cutting in again to the motor circuit the resistor sections103, 104 and 105.

` adapts itself to different mill speeds.

136, which, when actuated, establishes a shunt circuit, including aresistor 137', around the motor armature 101. Thus, during the firstpart of the return movement, when the blade-holder 15 is being rockedback, for instance, past its upper dead center, the motor is operatedslowly, but with sufficient power to effect the desired movement of theblade holder.

When the motor has made the initial part of its return movement, thearmature 101 is short circuited, so as to brake the return movement ofthe blade-holder, in which movement. gravity now takes part. Such shortcircuiting of the armature occurs upon the right hand end of the band122 reaching the brush 122a, whereupon a circuit is established throughthe actuating coil 1380l of a switch 138 which, when actuated,establishes a short circuit around the armature 101.

.Just before the blade-holder reaches its initial position, the lefthand end of the band 123 leaves the brush 123a, thereby deenergizing thereverse switches 114 and 116 and bringing all circuits back to thenormal deenergized condition shown in Fig. 6. Y

It will be noted the flying cutter of our invention is capable ofcutting the material at any desired point, entirely independent of thecircle which is described by the blade edge. Thus the material may becut into lengths of any desired nicety of dimension. All that is.necessary is to close the blade-motor circuit-making contact at such atime that the blade will reach the material at the point where it isdesired that the out shall be made. Moreover, the cutter is well adaptedfor operation on material moving at a high rate of speed such asfrequently obtains in rolling mill practice, particularly where, as inthe above-described form of the device, the blade has the greater partof an entire revolution in which to pick up to the linear speed of thematerial, and over a ,half revolution in which to be slowed down andstopped. Because of the control of the lade motor so that its speed ofoperation, in rotating the blade to effect the cut, is dependent on thespeed of the anvil motor, and thus corresponds with the mill speed, thecutter automatically Whilst we have described and shown one form oflying cutter in which our invention may be embodied, it is to beunderstood that the invention may be embodied in other forms, and thatchanges may be made in the form described and shown, without exceedingthe scope thereo as deiined in the appended claims. (f

We claim:

1. A iiying cutter for operating on moving material, comprising anormally stationary blade mounted for rotary movement and adapted tomake cutting engagement with the material at' a point in .such movement,a movable member, an electric motor for moving said member at-face speedwith the material, an electric motor adapted when energized to impartrotary movement to said blade, the stationary position occupied by lsaid blade being such that said blade reaches at .the cutting point aperipheral speed substantially equal to the linear speed of thematerial, and electrical means for coordinating the speed of saidsecond-named with that of said rst-named motor.

2. A flying cutter for operating on moving m'aterial, comprising anormally stationary blade mounted for rotary movement and adapted tomake cutting engagement With the material at a point in such movement, amember moving at face speed with the material, accelerating means forimparting rotary movement to said blade, means for controlling the speedof said accelerating means in accordance with the speed of said member,and means for adjusting the stationary position occupied by said bladeso that the latter reaches at the cutting pointa speed substantiallyequal to the linear speed of the material.

3. A yingcutter for operating on moving material, comprising a normallystationary blade mounted for rotary movement and adapted to make cuttingengagement with the material at a point in such movement, a movablemember, an electric motor for moving said member at face speed with thematerial, an electric motor adapted when energized to impart rotarymovement to said blade, means for adjusting the stationary positionyoccupied by said blade so that the latter reaches at the cutting pointa speed substantially equal to the linear speed of the material, andelectrical means for coordinating the speed of said secondnamed withthat of said iirst-named motor.

4. A ying cutter for operating on moving material, comprising a blademounted for rotary movement and adapted to make cutting engagement withthe material at a point in such movement, means for imparting rotarymovement to said blade, said means being constituted to accelerate saidblade to a peripheral speed substantially equal at the cutting point tothe linear speed of the material, means for braking said blade after theout has been made, and means for turning said blade in a reversedirection to return it towardsits stationary position.

5. A iiying cutter for operating on moving material, comprising anormally stationary blade mounted for rotary movement and adapted tomake cutting engagement with the material at a point in such movement,an electric motor adapted when energized to impart rotary movement tosaid blade, the stationary position occupied by said blade being suchthat said blade reaches at the cutting point a peripheral speedsubstantially equal to the linear speed of the material, means forreversing the current in said motor after the cut has been made, therebyto brake said blade, and means for reducing such reversed currentsubstantially on stoppage of said blade, whereby said motor returns saidblade relatively slowlyV towards its stationary position. K 6. A flyingcutter for operating onmoving material comprising a stop member, a blademounted for rotary movement and adapted to make cutting engagement withthe material at a point in such movement, a stop member associated withsaid blade and adapted for engagement with said first-named stop memberto maintain said blade in a stationary position, said stop members beingconstructed to permit passage of one past the other in the operatingdirection of movement of said blade, means for imparting an acceleratingrotary movement to said blade, and

means for stopping such movement after a roment of said blade, means forimparting an aclil() lati celerating rotary movement to said blade,means for stopping such movement after a rotation of said blade has beencompleted, and means for returning said blade to stationary position inwhich said stop members engage.

8. A ilying cutter for operating on moving material comprising a stopmember, a blade mounted for rotary movement and adapted to` make cuttingengagement with the material at a point in such movement, a stop memberassociated with said blade and adapted for engagement with saidfirst-named stop member to maintain said blade in a stationary position,said stop members being constructed to permit passage of one past theother in the operating direction of movement of said blade and one ofsaid members being adjustable to vary the stationary position of saidblade, means for imparting an accelerating rotary movement to saidblade, and means for stopping such movement after a rotation of saidblade has been completed.

9. A ying cutter for operating on moving material comprising .a stopmember, a blade mounted for rotary movement and adapted to make cuttingengagement with the material at a point in such movement, a stopmemberassociated with said blade and adapted for engagement with saidnist-named stop member to maintain said blade in a stationary position,said stop members being constructed to permit passage of one past theother in the operatng direction of movement of said blade, means forimparting an accelerating rotary movement to said blade, and means fordiscontinuing the driving action of said last-named means substantiallywhen the out is made, there' by permitting the blade to complet-e arotation by momentum. g

10. A flying cutter for operating on moving material comprising a stopmember, a blade mounted for rotary movement and adapted to make cuttingengagement with the material at a point in such movement, a stop memberassociated with said blade and adapted for engagement with saidrst-named stop member to maintain said blade in a stationary position,said stop members being constructed to permit passage of one past theother in the operating direction of movement of said blade, an electricmotor for imparting a. rotary movement to said blade when forwardlydriven, and a switch device for discontinuing forward driving of saidmotor substantially when the cut is made, thereby permitting the bladeto complete a rotation by momentum.

11. A ying cutter for operating on moving material comprising a stopmember, a blade mounted for rotary movement and adapted to make cuttingengagement with the material at a point in such movement, a stop memberassociated with said blade and adapted for engagement with saidfirst-named stop member tomaintain said blade in a stationary position,said stop members being constructed to permit passage of one past theother in the operating direction of movement of said blade, means forimparting an accelerating rotary movement to said blade, means fordiscontinuing the driving action of said last-named means substantiallyWhenthe cut is made, thereby permitting the blade to complete a rotationby momentum, and means for braking said'blade after the cut has beenmade. I

12. A ying cutter for operating on moving material comprising a stopmember, a blade mounted for rotary movement and adapted to make cuttingengagement with the materialat a point in such movement, a stop memberassoo n ngugc ciated with said blade and adapted for r ment with saidfirst-named stop member to maintain said blade in a stationaryposition,said stop members being constructed to permit passage of one past theother in t'ne operating direction of movement of said blade, an electricmotor for imparting a rot-ary movement to blade, and a switch device forreversing the c rent in said motor substantially vf made, thereby tobrake blade dur 'ff ther movement by momentum.

13. A ilying cutter for operating on moving material comprising a stopmember, a blade mounted for rotary movement and adapted to make cuttingengagement with the mat ial at a point in such movement, a stop mem. erassociated with said blade and adapted for engagement with saidfirst-named stop member toy maintain said blade in a stationaryposition. said stop members being constructed to permit passage of onepast the other in the operating direction of movement of said blade,electric motor for imparting a rotary movement to said blade, and aswitch device for reversing the current in said motor after the cut ismade, thereby to brake said blade during its further movement bymomentum, said switch device being timed further to cause said motor toreturn said biadctowards stationary position inwhich said stop-membersengage.

14. A flying cutter for operating on moving material comprising a stopmember, a blade mounted for rotary movement and adapte-'cl to makecutting engagement with the material at a point in such movement, a stopmember asseciated with said blade and adapted forengage.

ment with said first-named stop member to maintain said blade in astationary position, said stop members being constructed to permitpassage of one past the other in the operating direction of movement orsaid blade, an electric motor for imparting a rotary movement to saidblade, a switch device for reversing the current in said motorsubstantially when the cut is made, thereby to brake said blade duringits further movement by momentum, said switch device being timed furtherto cause said motor to return said blade towards stationary position inwhich said stop-members engage, and means for introducing a resistanceinto the circuit of s id motor during the return of said blade.

15. A flying cutter for operating on moving material, comprising ananvil roll, a cooperating cutting blade arranged in axial alignmentwithsaid roll and mounted for rotation about an axis parallel thereto,means for rotating the anvil roll continuously, and means for startingthe cutting blade from rest and bringing it up to the peripheral speedof the anvil roll by the time it is rotated int-o cutting relationtherewith and then bringing it to rest again after it has passed saidroll suciently far to permit the material to pass between the roil andblade without interference fromthe blade.

16. A nying cutter for operating on moving material, comprising an anvilroll, a cooperating cutting blade arranged in' axial alignment with saidroll and mounted for rotation about an axis parallel thereto, means forrotating the anvil roll continuously, means for starting the cuttingblade from rest and bringing it up to the peripheral speed of the anvilroll by the time it is rotated into cutting relation-therewith and thenbringing it to rest after it has passed said roll,

and adjustable means for determining the point said blade is brought torest after it passes the roll to determine the angular distance betweenthe starting and cutting point of said blade to allow for bringing theblade to diierent peripheral speeds by the time it is opposite the anvilroll. f

17. A flying cutter for moving material, comprising an anvil roll, acooperating cutting blade arranged in axial alignment with said roll andmounted for rotation about an axis parallel thereto, means for rotatingthe anvil roll continuousl an electric motor for rotating said cuttingblade, said motor being adapted to start said blade from rest and bringit up to the peripheral speed of the anvil roll by the time it is incutting relation therewith, and means for stopping the blade after ithas passed the anvil roll far enough that it will not interfere with thematerial passing between it and the anvil roll.

18. A flying cutter for moving material, cornprising anvil roll, acooperating cutting blade arranged in axial alignment with said roll andmounted for rotation about an axis parallel thereto, means for rotatingthe anvil roll continuously, an electric motor for rotating said cuttingblade, said motor being adapted to start said blade from rest and bringit up to the peripheral speed of the anvil roll by the time it isrotated into cutting relation therewith, means operable at will forstarting said bladeoperating motor, and means automatically operable forreversing said motor and arresting the movement of the cutting bladeafter it has passed out of cutting relation with the anvil roll.

19. A flying cutter for operating on moving material, comprising a blademounted for movement in a cycle and adapted to make cutting engagementwith the material at a point in such cycle, rotating means for actuatingsaid blade to cause said blade to complete a cycle in each rotation ofsaid means, means for actuating said rotating means, said last-namedmeans being constituted to actuate said rotating means toaccelerate saidblade to a peripheral speed substantially equal at the cutting point tothe linear speed of the material, and means for automatically modifyingthe speed of said second-named means to accord with varying speeds oflinear movement of the material.

20. A flying cutter for operating on moving material, comprising a blademounted for movement in a cycle and adapted to make cutting ,engagementwith the material at a point in such cycle, rotating means for actuatingsaid blade to cause said blade to complete a cycle in each ro tation ofsaid means, means for actuating said vrotating means, said last-namedmeans beingy constituted to actuate said rotating means to acceleratesaid blade to a peripheral speed substantially equal at the cuttingpoint to the linear speed of the materlal, means for braking saidrotating means after the cut has been made, and means for turning saidrotating means in a reverse direction to return it towards itsstationary position.

eral speed substantially equal at the cutting point to the linear speedof the material, and means for stopping said blade at such point thatthee said acceleration thereof occupies more than onehalf and less thanone revolution of said blade.

22. A flying cutter for operating onA moving material comprising acutter element, a blade mounted for movement in a cycle and associatedwith said cutter element to cooperate therewith, to effect a cut, duringeach cycle, normally stationary rotatable means for actuating-said bladeto complete a cycle in each rotation zthereof, a motor connected withsaid rotatable means for rotating the latter and acceleratingit to bringsaid blade to a peripheral speed substantially Vequal at the cuttingpoint to the linear speed of the material, and means for stopping saidrotatable means at such point that said acceleration thereof occupiesmore than one-'half and less than one revolution of said rotatablemeans.

23. In a flying cutter for cutting moving material, a rotatably mountedcutting blade adapted to produce a cut each time it is rotated, meansfor normally maintaining said blade in a selected position of rest,means for imparting rotary movement to said blade, said means beingadapted to accelerate said blade from rest to a peripheral speedsubstantially equal at the cutting point to the linear speed of thematerial, and means for automatically modifying the speed of operationof said blade actuating means to accord with varying speeds of linearmovement of the material.

24. An intermittently operable flying shear for cutting moving material,comprising, a cutter, a rotary anvil disposed to -assist in feeding thematerial through the shear and cooperate with said cutter in theproduction of cuts transversely of the material, and means for movingsaid cutter from a position of rest over said anvil in the direction oftravel of the materialto produce a cut and back to a position of rest.

25. An intermittently operable ying shear for cutting moving material,comprising, a cutter, a rotary anvil disposed to assist in feeding thematerial through the shear and cooperate with said cutter in theproduction of cuts transversely of the material, and means for movingsaid cutter from a position of rest over said anvil in the direction oftravel of the material to produce a cut and back to a position of rest,said means being adapted to cause the cutter to engage the material oncein each operation and to travel at substantially the speed of thematerial when producing a cut. f

FLORENCE C. BIGGERT, JR. JOHN A. SMITMANS.

